[libdc1394-devel] [Fwd: get_shutter causing lock ups]

[Dan D. <da...@de...>]

-----Forwarded Message-----
From: Dan Christian <Daniel.A.Christian@NASA.gov>
To: lin...@li...
Subject: get_shutter causing lock ups
Date: 26 Jun 2003 14:23:46 -0700

I'm running into some problems using machine vision cameras with Linux 
2.4.21+ 1394 updates.

My application grabs multiple images from multiple cameras.  I'm trying 
to capture the exposure information with each image: shutter and gain.

However, I'm running into two problems.  First, the gain and shutter 
values that I get are exactly the same for all images and all cameras.  
This is wrong.  There are different types of cameras and they should 
not be reading the same thing.

Second, eventually the application will hang waiting for image capture.  
Ctrl-C will cause a segmentation fault (even though the application 
tries to trap it).  It never leaves a core, so I don't know where it 
died.

At this point, I can no longer unload most of the 1394 drivers (raw1394 
can still be unloaded).  They claim to still be in use, but the 
application has exited.  I have to reboot to reset everything.

Is there something that breaks  reading parameters while doing DMA 
multi-grabs?  If I don't try to read the parameters, then everything 
runs fine.

Is there any way to get the drivers to unload after a application crash?

Thanks,
-Dan Christian


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